Hi guys I'm looking to find a valve box in which a valve went bad early fall last year. I tried to tone it out using the wires from the controller, but ran into too much interferance and lost the signal as I think it was too far away from the controller. I have a general idea of where it may be, but I could not find it even after many hours of searching for it. As a result the valve was not repaired and couldn't be winterized. As spring is fast approaching any ideas on how to locate this??? I have thought of a metal detector, but there are a lot of underground utlities in this area that I think may throw this off. It is a 37 zone system and located in a condo complex that I manage. Any help would be greatly appreciated.